I'd say more like every websites large enough that won't censor contents towards the liking of the Chinese government for their service within China got banned.

I'd say more like every websites large enough that won't censor contents towards the liking of the Chinese government for their service within China got banned. It's not an action against companies, but rather websites (as a form of media). Those companies can and are doing business in China, Facebook have sales agencies, Google have multiple offices and sales agencies, while the US quite literally banned Huawei as a company from doing business with anyone in the US.